Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * 	NetWinder Button Driver-
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *	Copyright (C) Alex Holden <alex@linuxhacker.org> 1998, 1999.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <asm/mach-types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define __NWBUTTON_C		/* Tell the header file who we are */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include "nwbutton.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static void button_sequence_finished(struct timer_list *unused);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static int button_press_count;		/* The count of button presses */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /* Times for the end of a sequence */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static DEFINE_TIMER(button_timer, button_sequence_finished);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static DECLARE_WAIT_QUEUE_HEAD(button_wait_queue); /* Used for blocking read */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static char button_output_buffer[32];	/* Stores data to write out of device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static int bcount;			/* The number of bytes in the buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static int bdelay = BUTTON_DELAY;	/* The delay, in jiffies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static struct button_callback button_callback_list[32]; /* The callback list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static int callback_count;		/* The number of callbacks registered */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static int reboot_count = NUM_PRESSES_REBOOT; /* Number of presses to reboot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * This function is called by other drivers to register a callback function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * to be called when a particular number of button presses occurs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  * The callback list is a static array of 32 entries (I somehow doubt many
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * people are ever going to want to register more than 32 different actions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * to be performed by the kernel on different numbers of button presses ;).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * However, if an attempt to register a 33rd entry (perhaps a stuck loop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  * somewhere registering the same entry over and over?) it will fail to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48)  * do so and return -ENOMEM. If an attempt is made to register a null pointer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49)  * it will fail to do so and return -EINVAL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50)  * Because callbacks can be unregistered at random the list can become
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * fragmented, so we need to search through the list until we find the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  * free entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  * FIXME: Has anyone spotted any locking functions int his code recently ??
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) int button_add_callback (void (*callback) (void), int count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	int lp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (callback_count == 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	if (!callback) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	callback_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	for (; (button_callback_list [lp].callback); lp++);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	button_callback_list [lp].callback = callback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	button_callback_list [lp].count = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * This function is called by other drivers to deregister a callback function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  * If you attempt to unregister a callback which does not exist, it will fail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * with -EINVAL. If there is more than one entry with the same address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  * because it searches the list from end to beginning, it will unregister the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * last one to be registered first (FILO- First In Last Out).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * Note that this is not necessarily true if the entries are not submitted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  * at the same time, because another driver could have unregistered a callback
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  * between the submissions creating a gap earlier in the list, which would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  * be filled first at submission time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) int button_del_callback (void (*callback) (void))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	int lp = 31;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	if (!callback) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	while (lp >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		if ((button_callback_list [lp].callback) == callback) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			button_callback_list [lp].callback = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			button_callback_list [lp].count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			callback_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		lp--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  * This function is called by button_sequence_finished to search through the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  * list of callback functions, and call any of them whose count argument
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  * matches the current count of button presses. It starts at the beginning
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  * of the list and works up to the end. It will refuse to follow a null
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  * pointer (which should never happen anyway).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static void button_consume_callbacks (int bpcount)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	int lp = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	for (; lp <= 31; lp++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		if ((button_callback_list [lp].count) == bpcount) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			if (button_callback_list [lp].callback) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 				button_callback_list[lp].callback();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)  * This function is called when the button_timer times out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)  * ie. When you don't press the button for bdelay jiffies, this is taken to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  * mean you have ended the sequence of key presses, and this function is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  * called to wind things up (write the press_count out to /dev/button, call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  * any matching registered function callbacks, initiate reboot, etc.).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static void button_sequence_finished(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (IS_ENABLED(CONFIG_NWBUTTON_REBOOT) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	    button_press_count == reboot_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		kill_cad_pid(SIGINT, 1);	/* Ask init to reboot us */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	button_consume_callbacks (button_press_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	bcount = sprintf (button_output_buffer, "%d\n", button_press_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	button_press_count = 0;		/* Reset the button press counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	wake_up_interruptible (&button_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /* 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  *  This handler is called when the orange button is pressed (GPIO 10 of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  *  SuperIO chip, which maps to logical IRQ 26). If the press_count is 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  *  this is the first press, so it starts a timer and increments the counter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  *  If it is higher than 0, it deletes the old timer, starts a new one, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  *  increments the counter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)  */ 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static irqreturn_t button_handler (int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	button_press_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	mod_timer(&button_timer, jiffies + bdelay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)  * This function is called when a user space program attempts to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)  * /dev/nwbutton. It puts the device to sleep on the wait queue until
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)  * button_sequence_finished writes some data to the buffer and flushes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  * the queue, at which point it writes the data out to the device and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  * returns the number of characters it has written. This function is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  * reentrant, so that many processes can be attempting to read from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  * device at any one time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static int button_read (struct file *filp, char __user *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	DEFINE_WAIT(wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	prepare_to_wait(&button_wait_queue, &wait, TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	finish_wait(&button_wait_queue, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	return (copy_to_user (buffer, &button_output_buffer, bcount))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		 ? -EFAULT : bcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * This structure is the file operations structure, which specifies what
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * callbacks functions the kernel should call when a user mode process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * attempts to perform these operations on the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static const struct file_operations button_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	.read		= button_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	.llseek		= noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /* 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)  * This structure is the misc device structure, which specifies the minor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)  * device number (158 in this case), the name of the device (for /proc/misc),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  * and the address of the above file operations structure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static struct miscdevice button_misc_device = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	BUTTON_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	"nwbutton",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	&button_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)  * This function is called to initialise the driver, either from misc.c at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)  * bootup if the driver is compiled into the kernel, or from init_module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)  * below at module insert time. It attempts to register the device node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)  * and the IRQ and fails with a warning message if either fails, though
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)  * neither ever should because the device number and IRQ are unique to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  * this driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static int __init nwbutton_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (!machine_is_netwinder())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	printk (KERN_INFO "NetWinder Button Driver Version %s (C) Alex Holden "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			"<alex@linuxhacker.org> 1998.\n", VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (misc_register (&button_misc_device)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		printk (KERN_WARNING "nwbutton: Couldn't register device 10, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 				"%d.\n", BUTTON_MINOR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	if (request_irq (IRQ_NETWINDER_BUTTON, button_handler, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			"nwbutton", NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		printk (KERN_WARNING "nwbutton: IRQ %d is not free.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 				IRQ_NETWINDER_BUTTON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		misc_deregister (&button_misc_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static void __exit nwbutton_exit (void) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	free_irq (IRQ_NETWINDER_BUTTON, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	misc_deregister (&button_misc_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) MODULE_AUTHOR("Alex Holden");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) module_init(nwbutton_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) module_exit(nwbutton_exit);